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I have bought many Makita packs from Doc Bass. I believe he sells them for $10 USD per pack. I have found that they usually have ten good cells and the BMS is gone, or there would be one bad cell, with nine good ones. So basically they are $1 USD per cell

I think maybe his point is that a high performance cell such as either A123 or Konion has a value of about $1/cell?

I've done a little more research on used 18650's based on items sold in this subforum. Packs made from Tesla and similar high capacity brand-name cells are remarkably similar about $3-4/cell, while A123 about $1-2/cell, and laptop lithium $0.50/cell or less.

Ordered 100 cells, got UPS tracking already. Will use them to stiffen saggy LiFePO4 inverter battery, those cells are power beasts!
Also thinking to assemble a starter battery for my car to replace lead acid one.
Shipping cost was surprisingly low.
All around katou is nice and easy to deal with seller.

Finally received a pack of 50 pairs (100 cells) on Tuesday, unfortunately my courier screwed up and took more time to deliver then actual shipping from Katou.

Packaging:
Very nice, 2 cardboard boxes with cushioning material in between.
Inner box with empty spaces filled so cells stay fixed.
Cells (I ordered unsorted As-is cells):
Whoever took apart used tool packs (I did, dozens of Makita packs with US18650VTC3 cells) knows, there are cosmetically 3 types of cells you get out 1)good 2)regular and 3)trash, before you even take some measurements.

Those I received are pairs already cut out of larger packs.
In my case, I got only type 1 and 2, cosmetically in good or regular shape, no really bad looking cells I would throw away if they work, 6 with slightly crashed (pressed in) positive button.

Tests:
I charged all to 3.6V between Tuesday (14pairs <0.5V) and Wednesday all the rest.
11 pairs from Tuesday batch, in 24h settled at 3.34-3.39V, 3 pairs fell below 3.3V and I cut the pairs open where 1 cell of each pair kept self discharging.

By now, can confirm 3 self discharging cells, out of 100.

Next to come:
1)Watch on self discharge.
2)Settle voltage on 3.9V overcharged cells, I have couple from Wednesday batch.
3)Will try to take random measurements of DCR with several fixed points in current flow and voltmeter approach.
4)Capacity tests are compromised ATM, my last charger/discharger gave up on discharge mode, it throws control error message.

I probably screwed up with charging the Tuesday batch because was able to push almost 0.1Ah more in every cell using Wednesday procedure. They where different because of initial SOC.
Wednesday batch including overcharged to 3.9V cells levelled in 3.4-3.5V range, which is the right number to expect in LiFePO world.

BTW, I was full of crappy ECO8s and ordered Turnigy Reaktor 1000W 30A, which looks like a copy of good, old and discontinued iCharger3010B I did like a lot, before overvolting. It will take 1-2 weeks to return testing.

I have been using a CBA III for my discharge testing. I think I will be changing my procedure very soon. Thanks for the suggestion re: the turnigy unit, I'll be checking that out. I'm due for an upgrade.

I expect about 80% good from unsorted cells from Dewalt packs, so your result of 14 pairs lower than 0.5v is higher than I like. If you choose to purchase any more, I will throw in some extra to bring your numbers up.